I work on mechanical watches too (indeed very rarely!) and I wonder if the visor could do a good job instead of the classic loupe; is there anyone here that can tell his/her experience with watches?
I have. One of my uncles (born 1902) was a jeweler and watch repairer. I spent many a weekend with him "picking ticks" in the early to late 1950's. Got to the point he would let me work on decent watches, e.g., disassembly, cleaning, replacing or making stems, crystals, jewels, and a few other things.
At that age, I didn't need a loupe for most things, and when I did, I used a classical jeweler's loupe. For convenience, e.g., reading the engraving on a chip, removing splinters, and reading small inscriptions, that is still what I prefer. He considered the young jewelers of that day who wore headbands, as not quite skilled.
I abhor (sort of) multifunction tools. They don't do anything well. That is, for assembling SMD and other electronics, I prefer a headband to anything else for comfort and ease of flipping it up or looking under it when I miss on my first attempt at replacing my soldering iron, which is usually done "blindly." I tried an electronic microscope and hated it for a variety of reasons. The classical loupe doesn't have enough working distance and is not good for hours of wearing. For other stuff, as mentioned, I prefer the classical loupe. For identifying yeasts ,ticks, etc., I prefer a classical optical microscope. I had all 4 and so rarely used the electronic microscope that I gave it to a grandchild.
My advice: Get something something that will do your most important activity well. Then, see how it works for the other things, and if not well enough, get another tool.